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a huge body of air that has similar temp, pressure, and humidity at any given height; classified by temp and humidity
form over dry areas of southwest and northern mexico; bring hot dry weather- southern great plains
form over central and northern canada and alaska, near arctic circle; bring clear, cold, dry air to north america (alberta clipper)
a fast moving cold air mass overtakes a warm air mass; rising warm air cools, clouds forms; may bring heavy storms followed by cooler, drier air and clear skies
a warm air mass overtakes a slow moving cold air mass; warm air moves over cold air; may cause several days of precipitation followed by warm and humid air
cold and warm air masses meet, but neither can move the other; water vapor in the warm air condenses into rain, snow, fog, or clouds; if stalled, may bring days of clouds and precipitation
a warm air mass is caught between 2 cooler air masses; cool air flows under warm; as warm air cools and its water vapor condenses, the weather may turn cloudy and rain or snow may fall (weather cloudy and wet)
swirling center of low air pressure; winds spin counterclockwise inwards towards center; bring clouds, wind, precipitation
swirling center of high air pressure; winds spin clockwise, outward from center; brings dry clear weather
a violent disturbance in the atmosphere; sudden changes in air pressure, causes rapid air movement
a small storm often accompianed by heavy precipitation and frequent thunder and lightning; form in large cumulonimbus clouds called thunderheads
a sudden spark or electrical discharge, as these changes jump between parts of a cloud, between nearby clouds, or between a cloud and the ground
____________: avoid places where lightning can strike and objects that conduct electricity
a rapidly whirling, funnel-shaped cloud that reaches down from a storm cloud to reach earth's surface
_______________: a storm shelter on the basement of a well-built building is the best place for protection; stay away from windows and doors, lie under a sturdy object; if outside-lie in ditch
a tropical cyclone that has winds of 119km per hour or higher; form in atlantic pacific indian oceans
how hurricanes form
begins over warm ocean water as a low pressure area, or tropical disturbance; if tropical disturbance grows in size and strength, it becomes a tropical storm hurricane
_____________: seek shelter, cover exposed parts of body, stay dry, car- keep exaust pipe clear
scientists who study the causes of weather and try to predict it- use maps, charts, and computers to analyze data and make forecasts
carries an instrument high into the troposphere and lower stratosphere to measure temp, air pressure and humidity
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